Oven



June 13, v1944.

E. W. COONEY OVEN Filed' Aug. 28, 1941 MWJMCO@ @5y @M0 9M Patented June13, 1944 OVEN Edward W. Cooney, Woodstock, Ill., assignor toInternational Harvester Company, a corpora,-l

.ton of New Jersey Application August 28, 1941, Serial No. 408,649

(or. 26a- 43) Claims.

This invention relates to an oven, and more particularly to an oven ofthe type used for drying various forms of articles.

In an oven of one particular type in which the invention finds itsgreatest utility there is provided a chamber which is heated to providedry heated air.` Articles, such as molding cores or the like, are placedwithin the chamber and the temperature of the oven is brought up to thepoint necessary to dry or otherwise treat the articles within thechamber. In those circumstances where the particular treatment is thatof drying, it is important that the drying process be performed asquickly and as efficiently as possible. To this end, then, it isimportant to excludefrom the oven such elements as will interfere withthe drying process, among the most undesirable elements of this typebeing moisture.

It is, accordingly, a principal object of this invention to provideanoven within which the air may be heated to the exclusion of theadmission of moisture to the heating chamber.

An important object is to provide a heating means adapted to carry aflame across the dry-` ing chamber, this means serving to confine theflame against direct contact with the interior of the chamber, thusexcluding from the chamber the products of fuel combustion.

Another important object is to provide a heal-,- ing elementwhichexhausts or ventsoutside the oven chamber.

One of the main objects of the invention is to providevmeans forsupplying air under pressure to the oven in a manner whereby the airwill be heated by the heating element in the oven.

An important object is to provide the heating means and theair-supplying means at a lower portion of the oven, so that the heatedair will rise in the oven to provide an eilicient drying process forarticles within the oven chamber.

lAnother object is to provide a common blower or pressuremeans forsupplying air to both the heating element and a jacket or heat exchangerassociated with the heating element.

Still another object is to provide a pilot burner in conjunction withthe exhaust end of the heating element to insure a continuous flame inthe element.

The foregoing and other desirable objects and features of the inventionwill become apparent to those skilled in the art as the disclosure ismore fully made.

The single ligure in the accompanying drawing illustrates a sectionalview through an oven of one particular type, in which is installed adevice constructed according to the principles of the present invention.k

The oven shown in the drawing comprises a bottom Wall I0, atop wall II,and a plurality of side Walls I2 to form a walled oven chamber I3. Thewalls are constructed of suitable material, all of which is generallyconventional. A fuel burner I4 is carried by a side wall I2 outside thechamber I3. This burner is connected by a conduitl I5 to a source offuel supply. The fuel may be gas of the type ordinarily used in furnaceand oven operations. The burner in cludes a nozzle I6 which supplies ordirects a continuous flame into the chamber. The flame is indicatedgenerally at F. Means is supplied for carrying the flame across thechamber I3 adjacent the bottom wall I0, and comprises an imperforateheating element, or tube, I1 connected at one end to the burner outletI6 and extending across the chamber I3. Adjacent one of the side WallsI2, the tube II is provided with an integral, upwardly extending portionI8 which parallels the wall I2 and which extends out through the upperwall II, as at I 9. As previ-v ously stated, the tube I'I is imperforateand is open only to the atmosphere outside the chamber I3. Thus, theflame F is confined within the tube against direct contact with theinterior of the chamber I3. The tube is located at a lower portion ofthe chamber, so that the heat therefrom rises in the chamber. For thepurposes of illustration, the oven is shown as containing a rack 20 onwhich is carried a plurality of articles to be treated or dried, as at2I. These articles may be molding cores or any other articles whichrequire a process capable of performance by the heating apparatus hereindisclosed. n

The portion of the tube I9 outside the oven chamber I3 carries a bracket22 which supports a small burner element 23. This element is providedwith a conduit 24 which is connected to a source of fuel supply. Theconduit 24 is connected to fuel independently of the connection I5 tothe burner I4, so that a continuous supply of fuel is insured to theburner 23 regardless of whether or not fuel is supplied to the burnerI4. Thus, the burner 23 constitutes a pilot burner which insuresignition of the flame in the tube I'I as long as fuel is supplied to theburner outlet I6. A hood 25 is disposed above the exhaust end I9 of thetube and serves to carry oif the exhaust fumes.

The numeral 26 indicates a blower means for supplying air to the burnerI4 to be mixed with the fuel I6 in the conventional manner. The blower26 and the burner I4 are connected by a conduit 21. The blower 26includes a second outlet 28, to which is connected a tube 29 whichextends upwardly outside the left-hand wall I2 and across the ovenoutside the wall II. The vertical portion I8 of the tube I1 issurrounded by means providing a heating jacket or heat exchanger 30. Asshown in the portion of the tube and jacket broken away in the drawing,the disposition of the jacket 30 and the tube portion I8 provides anannular space therebetween, as indicated at 3|. The air conduit 29communicates with the jacket 30 outside the chamber I3, as at 32. Thus,the blower 26 supplies air under pressure to the jacket or exchanger 30.rI'he jacket extends vertically downwardly about the tube portion I8 andfurther extends, as at 33, about a portion of thehorizontal tube I1. Theoutlet end 33 of the jacket is thus disposed at a lower portion of thechamber I3. The air supplied by the blower through the tube 29 andjacket 30 is thus heated by the tube portions I1 and I8 and dischargedat the bottom of the chamber below the rack 20. Accordingly, the chamberis heated both by the tube |1- and by the air forced into the chamber bythe blower 26 through the heat exchanger jacket 30. The vstructure ofthe oven is completed by the provision of a vent 34 which vents thechamber I3.

As stated above, one important feature of the invention is theimperforate heating tube I1. Since the tube is imperforate, the flame Fhas no direct contact with the `interior of the chamber and thus themoisture ordinarily resulting as a product of fuel combustion isprecluded from entering the chamber. This arrangement insures that theair in the chamber will be both hot and dry. Furthermore, the confiningof the flame within the tube eliminates the escape in the chamber ofother products of fuel combustion which may have an undesirable eiect onthe articles treated in the oven. The provision and disposition of theheat exchanger jacket in conjunction with the blower v2li insures aconstant supply of heated air at an advantageous point in the oven, sothat articles placed in the oven may be quickly and emciently treated bythe combination of heat and air.

The safety features incorporated in the construction consist of thepilot burner 23, hood 25, and the Vent 34, all of which contribute tothe operation of the oven without hazard.

Although the foregoing description has related to an oven which isprimarily useful in the treating of articles, it will be understood thatthe principles of the invention may be otherwise applicable in otherinstances. It will be further understood that only a preferredembodiment of the invention has been illustrated and described, and thatnumerous modications and alterations may be made therein withoutdeparting from the spirit and scope of the invention as defined in theappended claims.

What is claimed is:

1. A heating and drying oven comprising a walled drying chamber, a fuelburner having an outlet adapted to direct a llame into the chamber,means passing through the chamber and opening outside the chamber forconfining the flame against direct contact with the interior of thechamber, means for directing air into the oven for drying purposes, andmeans for directing said air under pressure first alongside a portion ofthe first means within the chamber for heating said air within thechamber.

2. A heating and drying oven comprising a walled drying chamber, a fuelburner outside the chamber, meansvconnected to the burner including animperforate heating tube passing through the chamber and exhaustingoutside the chamber, a second tube for the inlet of drying airsurrounding a portion of the heating tube inside the chamber, and meansfor directing incoming drying air into the second tube to be heated bythe first tube.

3. A heating and drying oven comprising a walled drying chamber, a fuelburner having an outlet adapted to direct a flame into the chamber, animperforate heating tube connected at one end to thel burner outlet andhaving a iirst portion extending across the chamber and a second portiondirected away from the first portion, the end of said second portionextending outside the chamber, a heating jacket surrounding the secondportion of the tube and extending outside the chamber along with saidsecond tube portion, said heating jacket opening within the chamber andmeans for directing air for dryingr purposes into the heating jacket tobe heated by the second tube portion and for discharge into the chamber.

4. A heating and drying oven comprising a drying chamber, a fuel burnerdisposed outside the chamber and having an outlet adapted to direct aflame into the chamber, an imperforate heating tube connected to theburner outlet and extending inside and along a lower portion of thechamber, and means for forcing a current of air for drying purposesthrough a conduit toa lower portion of the chamber and in heat exchangerelationship with said tube land an exhausting of the dry air within theoven chamber.

5. AV heating and drying oven comprising a walled drying chamber, a fuelburner outside the chamber, means connected to the burner including animperforate heating tube passing through the chamber and exhaustingoutside the chamber, a second tube for the inlet of drying airsurrounding a portion of the heating tube inside the chamber, means fordirecting incoming drying air 'into the second tube to beheated bythefirst tube, and a safety pilot burner outsidethe chamber adjacent theexhaust end of the first-named tube, whereby if the fuel yburner flameis accidentally extinguished vrthe safety pilot will ignite

